Boil milk and add sugar while stirring to dissolve all the sugar. Mix the custard power in water and add it to the boiling milk while stirring it. Continue stirring till you achieve a semi thick consistency and set it aside to cool.

For cake:

Once the custard is cooled add the chocolate power and crushed Marie biscuits. Mix it well till all the ingredients cum together. Add the Tutti Frutti and mix well and set the mixture aside. Soak the Rusk in the milk and arrange it as a base layer in a cake mould. Add the custard and biscuit mixture on top till it coats the Rusk . Add a second layer of Rusk on top followed by the custard and biscuit mixture. Leave the cake in the fridge for 2 hours. Cut the cake as a pastry and serve with Tutti Frutti topping.